Transparent display device

ABSTRACT

A transparent display device is disclosed, which may improve transmittance in a non-display area and at the same reduce resistance of power lines. The transparent display device includes a substrate provided with a display area, in which a plurality of subpixels are disposed, and a non-display area adjacent to the display area. The device includes a plurality of power lines provided in the non-display area over the substrate and extended in parallel in a first direction. The display area includes first non-transmissive areas provided with the plurality of subpixels and a first transmissive area provided between the first non-transmissive areas, the non-display area includes second non-transmissive areas provided with the plurality of power lines and a second transmissive area provided between the second non-transmissive areas.

CROSS REFERENCE TO RELATED APPLICATION

This application claims priority from Korean Patent Application No.10-2019-0176454, filed on Dec. 27, 2019, which is hereby incorporated byreference for all purposes as if fully set forth herein.

BACKGROUND Technical Field

The present disclosure relates to a transparent display device.

Description of the Related Art

With advancement in information-oriented societies, demands for displaydevices that display an image have increased in various forms. Recently,various types of display devices such as a liquid crystal display (LCD)device, a plasma display panel (PDP) device, and an organic lightemitting display (OLED) device, a quantum dot light emitting display(QLED) device have been widely utilized.

Recent, studies for transparent display devices for allowing a user tolook at objects or image arranged on an opposite side of a displaydevice after transmitting the display device are actively ongoing.

A transparent display device may include a display area on which animage is displayed, and a non-display area. A plurality of signal linesor connection electrodes may be disposed in the non-display area. In thetransparent display device, the plurality of signal lines or connectionelectrodes may be formed of a transparent metal material to enhancetransmittance in the non-display area. However, since the transparentmetal material generally has high resistance, the transparent displaydevice has a problem in that resistance of the plurality of signal linesor connection electrodes disposed in the non-display area is increased.

Meanwhile, in the transparent display device, the plurality of signallines or connection electrodes may be formed of a metal material havinglow resistance to reduce their resistance.

BRIEF SUMMARY

The inventors of the present disclosure recognized that to reduceresistance, an opaque metal material is generally used. The inventorshave further appreciated that using a low resistance opaque metalmaterial causes the transparent display device to have a lowtransmittance in the non-display area. Having recognized this problem,one or more embodiments of the present disclosure provides a transparentdisplay device improves transmittance in a non-display area and at thesame time reduce resistance of power lines. This cures one or moreproblems in the related art including the above identified problem.

Further embodiments of the present disclosure provides a transparentdisplay device that may reduce or minimize recognition of a non-displayarea.

In addition to the technical benefits of the present disclosure asmentioned above, additional benefits and features of the presentdisclosure will be clearly understood by those skilled in the art fromthe following description of the present disclosure.

In accordance with an aspect of the present disclosure, the above andother benefits can be accomplished by the provision of a transparentdisplay device. One embodiment of the transparent display deviceincludes a substrate provided with a display area, in which a pluralityof subpixels are disposed, and a non-display area adjacent to, and insome embodiments surrounding the display area, and a plurality of powerlines provided in the non-display area on the substrate and extended inparallel in a first direction. The display area includes firstnon-transmissive areas provided with the plurality of subpixels and afirst transmissive area provided between the first non-transmissiveareas, the non-display area includes second non-transmissive areasprovided with the plurality of power lines and a second transmissivearea provided between the second non-transmissive areas. The firsttransmissive area and the second transmissive area have the same shape.

In accordance with another aspect of the present disclosure, the aboveand other benefits can be accomplished by the provision of a transparentdisplay device including a substrate provided with a display area, inwhich a plurality of subpixels are disposed, a first non-display area onwhich a pad is disposed, and a second non-display area disposed inparallel with the first non-display area by interposing the displayarea, an anode electrode provided in each of the plurality of subpixelson the substrate, a light emitting layer provided on the anodeelectrode, a cathode electrode provided on the light emitting layer, anda plurality of first common power lines provided in the secondnon-display area on the substrate and electrically connected with thecathode electrode. The second non-display area includes a secondnon-transmissive area provided with the plurality of first common powerlines and a second transmissive area provided between the plurality offirst common power lines.

According to the present disclosure, the plurality of power lines may beprovided in the non-display area, and the transmissive area may beprovided between the plurality of common lines. As the transmissive areais provided in the non-display area, transmittance in the non-displayarea may be improved.

Also, according to the present disclosure, as the transmissive areaprovided in the non-display area and the transmissive area provided inthe display area have the same shape, transmittance similar to that inthe display area may be embodied in the non-display area.

Moreover, according to the present disclosure, color filters areprovided in the non-display area and patterned in the same shape as thatof color filters provided in the display area, whereby a differencebetween transmittance in the non-display area and transmittance in thedisplay area may be reduced or minimized. Therefore, recognition of thenon-display area may be reduced or minimized.

Also, according to the present disclosure, as the power lines providedin the non-display area are formed of a plurality of metal layers, theirtotal area may be increased. Therefore, even though each of the powerlines is formed with a narrow width, resistance may be prevented frombeing increased.

Also, according to the present disclosure, each of the metal linesprovided between the pad area and the display area, for example, acommon power line and a reference line may electrically be connectedwith the pad by using two connection electrodes disposed on theirrespective layers different from each other. Therefore, according to thepresent disclosure, a total area of each of the common power line andthe reference line may be increased, and resistance thereof may bereduced.

Also, according to the present disclosure, even though a defect occursin any one of two connection electrodes, the metal line and the pad maybe connected with each other by the other one of the two connectionelectrodes. Therefore, a voltage may stably be supplied to thesubpixels, and panel yield may be improved.

Also, according to the present disclosure, a defect of a drivingtransistor may be tested before the anode electrode is deposited. Sincea repair process may be performed before the anode electrode isdeposited, repair yield may be prevented from being reduced by the anodeelectrode. Also, a tact time may be reduced.

In addition to the effects of the present disclosure as mentioned above,additional advantages and features of the present disclosure will beclearly understood by those skilled in the art from the abovedescription of the present disclosure.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

The above and other features and other advantages of the presentdisclosure will be more clearly understood from the following detaileddescription taken in conjunction with the accompanying drawings, inwhich:

FIG. 1 is a perspective view illustrating a transparent display deviceaccording to one embodiment of the present disclosure;

FIG. 2 is a schematic plane view illustrating a transparent displaypanel;

FIG. 3 is an enlarged view of an area A in FIG. 2 ;

FIG. 4 is a cross-sectional view taken along line I-I′ of FIG. 3 ;

FIG. 5 is an enlarged view of an area B in FIG. 2 ;

FIG. 6 is a cross-sectional view taken along line II-II′ of FIG. 5 ;

FIG. 7 is a cross-sectional view taken along line of III-III′ FIG. 5 ;

FIG. 8 is a cross-sectional view taken along line IV-IV′ of FIG. 5 ;

FIG. 9 is an enlarged view of an area C in FIG. 2 ;

FIG. 10 is a cross-sectional view taken along line V-V′ of FIG. 9 ;

FIG. 11 is a cross-sectional view taken along line VI-VI′ of FIG. 9 ;

FIG. 12 is a cross-sectional view taken along line VII-VII′ of FIG. 9 ;and

FIG. 13 is a cross-sectional view illustrating a modified example ofFIG. 11 .

DETAILED DESCRIPTION

Advantages and features of the present disclosure, and implementationmethods thereof will be clarified through following embodimentsdescribed with reference to the accompanying drawings. The presentdisclosure may, however, be embodied in different forms and should notbe construed as limited to the embodiments set forth herein. Rather,these embodiments are provided so that this disclosure will be thoroughand complete, and will fully convey the scope of the present disclosureto those skilled in the art.

A shape, a size, a ratio, an angle, and a number disclosed in thedrawings for describing embodiments of the present disclosure are merelyan example, and thus, the present disclosure is not limited to theillustrated details. Like reference numerals refer to like elementsthroughout the specification. In the following description, when thedetailed description of the relevant known function or configuration isdetermined to unnecessarily obscure the important point of the presentdisclosure, the detailed description will be omitted. In a case where‘comprise,’ ‘have,’ and ‘include’ described in the present specificationare used, another part may be added unless ‘only˜’ is used. The terms ofa singular form may include plural forms unless referred to thecontrary.

In construing an element, the element is construed as including an errorrange although there is no explicit description.

In describing a position relationship, for example, when the positionrelationship is described as ‘upon˜,’ ‘above˜,’ ‘below˜,’ and ‘nextto˜,’ one or more portions may be arranged between two other portionsunless ‘just’ or ‘direct’ is used.

It will be understood that, although the terms “first,” “second,” etc.,may be used herein to describe various elements, these elements shouldnot be limited by these terms. These terms are only used to distinguishone element from another. For example, a first element could be termed asecond element, and, similarly, a second element could be termed a firstelement, without departing from the scope of the present disclosure.

In describing elements of the present disclosure, the terms “first,”“second,” etc., may be used. These terms are intended to identify thecorresponding elements from the other elements, and basis, order, ornumber of the corresponding elements are not limited by these terms. Theexpression that an element is “connected” or “coupled” to anotherelement should be understood that the element may directly be connectedor coupled to another element but may indirectly be connected or coupledto another element unless specially mentioned, or a third element may beinterposed between the corresponding elements.

Features of various embodiments of the present disclosure may bepartially or overall coupled to or combined with each other, and may bevariously inter-operated with each other and driven technically as thoseskilled in the art can sufficiently understand. The embodiments of thepresent disclosure may be carried out independently from each other, ormay be carried out together in co-dependent relationship.

Hereinafter, an example of a transparent display device according to thepresent disclosure will be described in detail with reference to theaccompanying drawings. Wherever possible, the same reference numberswill be used throughout the drawings to refer to the same or like parts.

FIG. 1 is a perspective view illustrating a transparent display deviceaccording to one embodiment of the present disclosure.

Hereinafter, X axis indicates a line parallel with a gate line, Y axisindicates a line parallel with a data line, and Z axis indicates aheight direction of a transparent display device 100.

Although a description has been described based on that the transparentdisplay device 100 according to one embodiment of the present disclosureis embodied as an organic light emitting display device, the transparentdisplay device 100 may be embodied as a liquid crystal display device(LCD), a plasma display panel (PDP), a Quantum dot Light EmittingDisplay (QLED) or an Electrophoresis display device.

Referring to FIG. 1 , the transparent display device 100 according toone embodiment of the present disclosure includes a transparent displaypanel 110, a source drive integrated circuit (IC) 210, a flexible film220, a circuit board 230, and a timing controller 240.

The transparent display panel 110 includes a first substrate 111 and asecond substrate 112, which face each other. The second substrate 112may be an encapsulation substrate. The first substrate 111 may be aplastic film, a glass substrate, or a silicon wafer substrate formedusing a semiconductor process. The second substrate 112 may be a plasticfilm, a glass substrate, or an encapsulation film. The first substrate111 and the second substrate 112 may be made of a transparent material.

The gate driver supplies gate signals to the gate lines in accordancewith a gate control signal which is provided from the timing controller240. The gate driver may be provided in one side of the display area ofthe transparent display panel 110, or the non-display area of bothperipheral sides of the transparent display panel 110 by a gate driverin panel (GIP) method. In another way, the gate driver may bemanufactured in a driving chip, may be mounted on the flexible film, andmay be attached to one side of the display area of the transparentdisplay panel 110, or the non-display area of both peripheral sides ofthe transparent display panel 110 by a tape automated bonding (TAB)method.

The source drive IC 210 receives digital video data and source controlsignals from the timing controller 240. The source drive IC 210 convertsthe digital video data into analog data voltages in accordance with thesource control signal, and supplies the analog data voltages to the datalines. If the source drive IC 210 is manufactured in a driving chip, thesource drive IC 210 may be mounted on the flexible film 220 by a chip onfilm (COF) method or a chip on plastic (COP) method.

Pads, such as power pads and data pads, may be formed in a non-displayarea of the transparent display panel 110. Lines connecting the padswith the source drive IC 210 and lines connecting the pads with lines ofthe circuit board 230 may be formed in the flexible film 220. Theflexible film 220 may be attached onto the pads using an anisotropicconducting film, whereby the pads may be connected with the lines of theflexible film 220.

FIG. 2 is a schematic plane view illustrating a transparent displaypanel, FIG. 3 is an enlarged view of an area A in FIG. 2 , FIG. 4 is across-sectional view taken along line I-I′ of FIG. 3 .

The substrate 111 may include a display area DA where pixels P areformed to display an image, and a non-display area NDA that does notdisplay an image.

The display area DA, as shown in FIG. 3 , includes a transmissive areaTA and a non-transmissive area NTA. The transmissive area TA is an areathrough which most of externally incident light passes, and thenon-transmissive area NTA is an area through which most of externallyincident light fails to transmit. For example, the transmissive area TAmay be an area where light transmittance is greater than α %, forexample, 90%, and the non-transmissive area NTA may be an area wherelight transmittance is smaller than β %, for example, 50%. In someembodiments, α is greater than β. A user may view an object orbackground arranged on a rear surface of the transparent display panel110 due to the transmissive area TA.

The non-transmissive area NTA may be provided with pixel power linesVDDL, common power lines VSSL, reference lines, data lines, gate linesGL, and pixels P.

The gate lines GL may be extended in a first direction (e.g., X axisdirection), and may cross (or overlap) the pixel power lines VDDL, thecommon power lines VSSL and the data lines in the display area DA.

The pixel power lines VDDL, the common power lines VSSL, the referencelines and the data lines may be extended in a second direction (e.g., Yaxis direction). In some embodiments, the pixel power lines VDDL and thecommon power lines VSSL may alternately be disposed in the display areaDA. The transmissive area TA may be disposed between the pixel powerline VDDL and the common power line VSSL.

The pixels P emit predetermined light to display an image. An emissionarea EA may correspond to an area, from which light emits, in the pixelP.

Each of the pixels P may include a first subpixel P1, a second subpixelP2, and a third subpixel P3. The first subpixel P1 may be provided toinclude a first emission area EA1 emitting green light, the secondsubpixel P2 may be provided to include a second emission area EA2emitting red light, and the third subpixel P3 may be provided to includea third emission area EA3 emitting blue light, but these subpixel arenot limited thereto. Each of the pixels P may further include a subpixelemitting white light W. An arrangement sequence of the subpixel P1, P2,and P3 may be changed in various ways.

Hereinafter, for convenience of description, a description will be givenbased on that the first subpixel P1 is a green subpixel emitting greenlight, the second subpixel P2 is a red subpixel emitting red light, andthe third subpixel P3 is a blue subpixel emitting blue light.

Each of the first subpixel P1, the second subpixel P2, and the thirdsubpixel P3, as shown in FIG. 4 , may include a circuit element thatincludes a capacitor, a thin film transistor, and a light emittingdiode. The thin film transistor may include a switching transistor, asensing transistor, and a driving transistor T.

The switching transistor is switched in accordance with a gate signalsupplied to the gate line GL and serves to supply a data voltagesupplied from the data line to the driving transistor T.

The sensing transistor serves to sense a threshold voltage deviation ofthe driving transistor T, which is a cause of image quality degradation.

The driving transistor T is switched in accordance with the data voltagesupplied from the switching transistor to generate a data current from apower source supplied from the pixel power line VDDL, and serves tosupply the generated data current to the anode electrode 120 of thepixel.

The driving transistor T includes an active layer ACT, a gate electrodeGE, a source electrode SE, and a drain electrode DE.

In detail, the active layer ACT may be provided over the first substrate111. The active layer ACT may be formed of a silicon based semiconductormaterial or an oxide based semiconductor material. A buffer layer (notshown) may be provided between the active layer ACT and the firstsubstrate 111.

A gate insulating layer GI may be provided over the active layer ACT.The gate insulating layer GI may be formed an inorganic film, forexample, a silicon oxide (SiOx) film, a silicon nitride (SiNx) film, ora multi-layered film of SiOx and SiNx.

A gate electrode GE may be provided over the gate insulating layer GI.The gate electrode GE may be formed of a single layer or a multi-layermade of any one of Mo, Al, Cr, Au, Ti, Ni, Nd, and Cu or their alloy.

A first inter-layer insulating layer ILD1 and a second inter-layerinsulating layer ILD2 may be provided over the gate electrode GE. Thefirst inter-layer insulating layer ILD1 and the second inter-layerinsulating layer ILD2 may be formed an inorganic layer, for example, asilicon oxide (SiOx) layer, a silicon nitride (SiNx) layer, or amulti-layered layer of SiOx and SiNx.

Source and drain electrodes SE and DE may be provided over the secondinter-layer insulating layer ILD2. One of the source and drainelectrodes SE and DE may be connected to the active layer ACT through asecond contact hole CH2 that passes through the gate insulating layer GIand the first and second inter-layer insulating layers ILD1 and ILD2.

The source and drain electrodes SE and DE may be formed of a singlelayer or a multi-layer made of any one of Mo, Al, Cr, Au, Ti, Ni, Nd,and Cu or their alloy.

A first planarization layer PLN1 may be provided over the source anddrain electrodes SE and DE to planarize a step difference caused by thedriving transistor T. The first planarization layer PLN1 may be formedof an organic layer, for example, acryl resin, epoxy resin, phenolicresin, polyamide resin, polyimide resin, etc.

An anode auxiliary electrode 115 may be provided over the firstplanarization layer PLN1. The anode auxiliary electrode 115 may beconnected to one of the source and drain electrodes SE and DE through athird contact hole CH3 that passes through the first planarization layerPLN1. For example, the anode auxiliary electrode 115 may be connected tothe drain electrode DE through the third contact hole CH3 that passesthrough the first planarization layer PLN1.

The anode auxiliary electrode 115 may be formed of a single layer or amulti-layer made of any one of Mo, Al, Cr, Au, Ti, Ni, Nd, and Cu ortheir alloy.

A second planarization layer PLN2 may be formed over the anode auxiliaryelectrode 115. The second planarization layer PLN2 may be formed of anorganic layer, for example, acryl resin, epoxy resin, phenolic resin,polyamide resin, polyimide resin, etc.

Light emitting diodes, which are comprised of the anode electrode 120, alight emitting layer 130, and a cathode electrode 140, and a bank 125are provided over the second planarization layer PLN2.

The anode electrode 120 may be provided for each of the subpixels P1, P2and P3. The anode electrode 120 is not provided in the transmissive areaTA.

The anode electrode 120 may be connected with the driving transistor T.In detail, the anode electrode 120 may be connected to the anodeauxiliary electrode 115 through a first contact hole CH1 that passesthrough the second planarization layer PLN2. Since the anode auxiliaryelectrode 115 is connected to the source electrode SE or the drainelectrode DE of the driving transistor T through the third contact holeCH3, the anode electrode 120 may electrically be connected with thedriving transistor T.

The anode electrode 120 may be formed of a metal material of highreflectivity such as a deposited structure (Ti/Al/Ti) of aluminum andtitanium, a deposited structure (ITO/Al/ITO) of aluminum and ITO, an Agalloy and a deposited structure (ITO/Ag alloy/ITO) of Ag alloy and ITO.The Ag alloy may be an alloy of silver (Ag), palladium (Pb), and Copper(Cu).

A bank 125 may be provided over a second planarization layer PLN2. Also,the bank 125 may be formed to cover each edge of the anode electrode 120and partially expose the anode electrode 120. Therefore, the bank 125may prevent light emitting efficiency from being deteriorated due to acurrent concentrated on the ends of anode electrode 120.

The bank 125 may respectively define emission areas EA1, EA2, and EA3 ofthe subpixels P1, P2, and P3. Each of the emission areas EA1, EA2, andEA3 of the subpixels P1, P2, and P3 indicates an area where the anodeelectrode 120, the light emitting layer 130 and the cathode electrode140 are sequentially deposited and then holes from the anode electrode120 and electrons from the cathode electrode 140 are combined with eachother in the light emitting layer 130 to emit light. In this case, thearea where the bank 125 is not formed and the anode electrode 120 isexposed may be an emission area EA, and the other area may be anon-emission area NEA.

The bank 125 may be formed of an organic layer, for example, acrylresin, epoxy resin, phenolic resin, polyamide resin, polyimide resin,etc.

The organic light emitting layer 130 may be provided over the anodeelectrode 120. The organic light emitting layer 130 may include a holetransporting layer, a light emitting layer, and an electron transportinglayer. In this case, if a voltage is applied to the anode electrode 120and the cathode electrode 140, holes and electrons move to the lightemitting layer through the hole transporting layer and the electrontransporting layer, respectively, and are combined with each other inthe light emitting layer to emit light.

The organic light emitting layer 130, as shown in FIG. 4 , may includelight emitting layers each of which is formed for each of the subpixelsP1, P2, and P3. For example, a green light emitting layer 131 emittinggreen light may be formed in the first subpixel P1, a red light emittinglayer 132 emitting red light may be formed in the second subpixel P2,and a blue light emitting layer 133 emitting blue light may be formed inthe third subpixel P3. In this case, the light emitting layers of theorganic light emitting layer 130 are not formed in the transmissive areaTA.

The cathode electrode 140 may be provided over the organic lightemitting layer 130 and the bank 125. The cathode electrode 140 may beprovided in the transmissive area TA as well as the non-transmissivearea NTA that includes the emission area EA, but is not limited thereto.The cathode electrode 140 may be provided in only the non-transmissivearea NTA that includes the emission area EA, and may not be provided inthe transmissive area TA to improve transmittance.

The cathode electrode 140 may be a common layer commonly formed for thesubpixels P1, P2, and P3 to apply the same voltage to the subpixels P1,P2, and P3. The cathode electrode 140 may be formed of a transparentconductive material (TCO) such as ITO and IZO, which can transmit light,or may be formed of a semi-transmissive conductive material such as Mg,Ag, or alloy of Mg and Ag. If the cathode electrode 140 is formed of asemi-transmissive conductive material, emission efficiency may beenhanced by micro cavity.

An encapsulation layer 150 may be provided over the light emittingdiodes. The encapsulation layer 150 may be formed over the cathodeelectrode 140 to overlay the cathode electrode 140. The encapsulationlayer 150 serves to prevent oxygen or water from being permeated intothe organic light emitting layer 130 and the cathode electrode 140.Accordingly, in some embodiments, the encapsulation layer 150 mayinclude at least one inorganic film and at least one organic film.

Meanwhile, although not shown in FIG. 4 , a capping layer mayadditionally be formed between the cathode electrode 140 and theencapsulation layer 150.

A color filter layer 170 may be provided over the encapsulation layer150. The color filter layer 170 may be provided over one surface of thesecond substrate 112 that faces the first substrate 111. In this case,the first substrate 111 provided with the encapsulation layer 150 andthe second substrate 112 provided with the color filter layer 170 may bebonded to each other by an adhesive layer 160. In some embodiments, theadhesive layer 160 may be an optically clear resin (OCR) layer or anoptically clear adhesive (OCA) film.

The color filter layer 170 may be formed to be patterned for each of thesubpixels P1, P2 and P3. In detail, the color filter layer 170 mayinclude a first color filter CF1, a second color filter CF2, and a thirdcolor filter CF3. The first color filter CF1 may be disposed tocorrespond to the emission area EA1 of the first subpixel P1, and may bea green color filter that transmits green light. The second color filterCF2 may be disposed to correspond to the emission area EA2 of the secondsubpixel P2, and may be a red color filter that transmits red light. Thethird color filter CF3 may be disposed to correspond to the emissionarea EA3 of the third subpixel P3, and may be a blue color filter thattransmits blue light.

The transparent display panel 110 according to one embodiment of thepresent disclosure is characterized in that a polarizer is not used, andthe color filter layer 170 is formed in the second substrate 112. If thepolarizer is attached to the transparent display panel 110,transmittance of the transparent display panel 110 is reduced by thepolarizer. Meanwhile, if the polarizer is not attached to thetransparent display panel 110, a problem occurs in that externallyincident light is reflected towards the electrodes.

Since a polarizer is not attached to the transparent display panel 110according to one embodiment of the present disclosure, transmittance maybe prevented from being reduced. Also, in the transparent display panel110 according to one embodiment of the present disclosure, the colorfilter layer 170 may be formed in the second substrate 112 to partiallyabsorb externally incident light, thereby preventing the incident lightfrom being reflected toward the electrodes. That is, the transparentdisplay panel 110 according to one embodiment of the present disclosuremay reduce external light reflectivity without reducing transmittance.

Meanwhile, a black matrix BM may be provided among the color filtersCF1, CF2 and CF3. The black matrix BM may be provided among thesubpixels P1, P2, and P3 to prevent color mixture among the adjacentsubpixels P1, P2, and P3 from occurring. Also, the black matrix BM mayprevent externally incident light from being reflected toward aplurality of lines provided among the subpixels P1, P2, and P3, forexample, the gate lines, the data lines, the pixel power lines, thecommon power lines, the reference lines, etc.

The black matrix BM may include a material that absorbs light, forexample, a black dye that absorbs light of a visible light wavelengthrange.

Referring to FIG. 2 again, the non-display area NDA may be provided witha pad area PA in which pads PAD are disposed, and at least one gatedriver 205.

In detail, the non-display area NDA may include a first non-display areaNDA1 in which the pads PAD are disposed, a second non-display area NDA2disposed in parallel with the first non-display area NDA1 by interposingthe display area DA, and third and fourth non-display areas NDA3 andNDA4 connecting the first non-display area NDA1 with the secondnon-display area NDA2.

The gate driver 205 is connected to the gate lines GL and supplies gatesignals to the gate lines GL. The gate driver 205 may be disposed in atleast one of the fourth non-display area NDA4 and the third non-displayarea NDA3 in a gate drive in panel (GIP) type. For example, as shown inFIG. 2 , the gate driver 205 may be formed in the fourth non-displayarea NDA4, and another gate driver 205 may be formed in the thirdnon-display area NDA3, but is not limited thereto. The gate driver 205may be formed in any one of the fourth non-display area NDA4 and thethird non-display area NDA3.

The pads PAD may include a first pad VDDP, a second pad VSSP, a thirdpad VREFP, and a fourth pad DP, and may be provided in the firstnon-display area NDA1. That is, the first non-display area NDA1 mayinclude a pad area PA.

The transparent display panel 110 according to one embodiment of thepresent disclosure may include a plurality of signal lines connectedwith the subpixels P1, P2 and P3 provided in the display area DA. Forexample, the transparent display panel 110 according to one embodimentof the present disclosure may include a pixel power line VDD, a commonpower line VSS and a reference line VREF.

The pixel power line VDD may supply a first power source to the drivingtransistor T of each of the subpixels P1, P2 and P3 provided in thedisplay area DA.

Accordingly, in some embodiments, the pixel power line VDD may include afirst pixel power line VDD1 provided in a first non-display area NDA1, asecond pixel power line VDD2 provided in a second non-display area NDA2,and a plurality of third pixel power lines VDDL connecting the firstpixel power line VDD1 with the second pixel power line VDD2.

The common power line VSS may supply a second power source to thecathode electrode 140 of the subpixels P1, P2, and P3 provided in thedisplay area DA. In some embodiments, the second power source may be acommon power source commonly supplied to the subpixels P1, P2, and P3.

Accordingly, in some embodiments, the common power line VSS may includea first common power line VSS1 provided in the first non-display areaNDA1, a second common power line VSS2 provided in the second non-displayarea NDA2, and a plurality of third common power lines VSSL connectingthe first common power line VSS1 with the second common power line VSS2.

The reference line VREF may supply an initialization voltage (or sensingvoltage) to the driving transistor T of each of the subpixels P1, P2,and P3 provided in the display area DA.

Accordingly, in some embodiments, the reference line VREF may include afirst reference line VREF1 provided in the first non-display area NDA1,and a plurality of second reference lines VREFL disposed in the displayarea DA.

Hereinafter, the first pixel power line VDD1, the first common powerline VSS1 and the first reference line VREF1, which are provided in afirst non-display area NDA1, will be described in more detail withreference to FIGS. 5 to 8 .

FIG. 5 is an enlarged view of an area B in FIG. 2 , FIG. 6 is across-sectional view taken along line II-II′ of FIG. 5 , FIG. 7 is across-sectional view taken along line III-III′ of FIG. 5 , and FIG. 8 isa cross-sectional view taken along line IV-IV′ of FIG. 5 .

The pads PAD, a first pixel power line VDD1, a first common power lineVSS1, a first reference line VREF1, a third pixel power line VDDL and athird common power line VSSL are provided in the first non-display areaNDA1.

Referring to FIGS. 2, 5 and 6 , the first pixel power line VDD1 may beprovided to be extended in the first non-display area NDA1, specificallybetween the pad area PA and the display area DA in a first direction(e.g., X axis direction). The first pixel power line VDD1 may beconnected with the first pad VDDP in the first non-display area NDA1,and may be supplied with a first power source from the first pad VDDP.The first pad VDDP may be extended in a second direction (e.g., Y axisdirection), and may be connected with the first pixel power line VDD1.For example, the first pixel power line VDD1 and the first pad VDDP maybe provided in the same layer as shown in FIG. 6 , and may be connectedwith each other without being spaced apart from each other.

Also, the first pixel power line VDD1 may be connected with a pluralityof third pixel power lines VDDL disposed in the display area DA, and maysupply the first power source to the driving transistor T of each of thesubpixels P1, P2 and P3 through the plurality of third pixel power linesVDDL.

The first pixel power line VDD1 may be made of a plurality of metallayers. For example, the first pixel power line VDD1, as shown in FIG. 6, may include a first metal layer VDD1-1 and a second metal layer VDD1-2provided over the first metal layer VDD1-1. The first metal layer VDD1-1and the second metal layer VDD1-2 may partially be overlapped with eachother, and may be connected with each other through a fourth contacthole CH4.

In some embodiments, the first metal layer VDD1-1 of the first pixelpower line VDD1 may be provided in the same layer as the sourceelectrode SE and the drain electrode DE of the driving transistor Tprovided in the display area DA. The first metal layer VDD1-1 may bemade of the same material as that of the source electrode SE and thedrain electrode DE of the driving transistor T and may be simultaneouslyformed with them.

The second metal layer VDD1-2 of the first pixel power line VDD1 may beprovided in the same layer as the anode auxiliary electrode 115 providedin the display area DA. The second metal layer VDD1-2 may be made of thesame material as that of the anode auxiliary electrode 115 and may beformed simultaneously with the anode auxiliary electrode 115. In thiscase, the second metal layer VDD1-2 of the first pixel power line VDD1may be connected to the first metal layer VDD1-1 through a plurality offourth contact holes CH4 that pass through the first planarization layerPLN1.

In the transparent display panel 110 according to one embodiment of thepresent disclosure, as the first pixel power line VDD1 provided in thenon-display area NDA is provided as a double layer, a total area of thefirst pixel power line VDD1 may be increased, whereby resistance of thefirst pixel power line VDD1 may be reduced.

Also, in the transparent display panel 110 according to one embodimentof the present disclosure, as the second metal layer VDD1-2 of the firstpixel power line VDD1 may be connected to the first metal layer VDD1-1through the plurality of fourth contact holes CH4, the first metal layerVDD1-1 and the second metal layer VDD1-2 may stably be connected witheach other.

Meanwhile, in the transparent display panel 110 according to oneembodiment of the present disclosure, the first metal layer VDD1-1 andthe second metal layer VDD1-2 of the first pixel power line VDD1 are notin entire contact with each other. If the first metal layer VDD1-1 andthe second metal layer VDD1-2 of the first pixel power line VDD1 are inentire contact with each other, even though the second planarizationlayer PLN2 is deposited over the second metal layer VDD1-2, an uppersurface of the area where the first metal layer VDD1-1 and the secondmetal layer VDD1-2 are in contact with each other may be formed to berecessed toward the first substrate 111 without being planarized. Forthis reason, a problem may occur in that the layers formed over thefirst metal layer VDD1-1 and the second metal layer VDD1-2 of the firstpixel power line VDD1, for example, a second common power connectionelectrode 185, the cathode electrode 140, the encapsulation layer 150are not deposited stably.

In the transparent display panel 110 according to one embodiment of thepresent disclosure, the first metal layer VDD1-1 and the second metallayer VDD1-2 of the first pixel power line VDD1 may be in contact witheach other through the plurality of fourth contact holes CH4 withoutentire contact. In the transparent display panel 110 according to oneembodiment of the present disclosure, if the second planarization layerPLN2 is formed over the second metal layer VDD1-2, a planarized uppersurface may be provided even in the area where the first metal layerVDD1-1 and the second metal layer VDD1-2 are in contact with each other.Therefore, in the transparent display panel 110 according to oneembodiment of the present disclosure, the layers formed over the firstmetal layer VDD1-1 and the second metal layer VDD1-2 of the first pixelpower line VDD1, for example, the second common power connectionelectrode 185, the cathode electrode 140, the encapsulation layer 150may be deposited stably.

The third pixel power line VDDL may be provided between the transmissiveareas TA in the display area DA, and thus may be connected with thedriving transistor T of each of the subpixels P1, P2 and P3. The thirdpixel power line VDDL may be extended in the display area DA in a seconddirection (e.g., Y axis direction), and thus its one end may beconnected with the first pixel power line VDD1.

In some embodiments, the third pixel power line VDDL may be connectedwith the first pixel power line VDD1 as one layer but may be connectedwith the first pixel power line VDD1 as a plurality of layers as shownin FIG. 6 .

For example, the third pixel power line VDDL may include a second metallayer VDDL-2 and a third metal layer VDDL-3 provided below the secondmetal layer VDDL-2. The second metal layer VDDL-2 of the third pixelpower line VDDL may be extended in the display area DA to the firstnon-display area NDA1 in a second direction (e.g., Y axis direction).The second metal layer VDDL-2 may be provided in the same layer as theanode auxiliary electrode 115 provided in the display area DA. Thesecond metal layer VDDL-2 may be made of the same material as that ofthe anode auxiliary electrode 115 and may be formed simultaneously withthe anode auxiliary electrode 115.

One end of the third metal layer VDDL-3 of the third pixel power lineVDDL may be connected to the second metal layer VDDL-2 of the thirdpixel power line VDDL in the first non-display area NDA1, and the otherend thereof may be connected to the first pixel power line VDD1. Thethird metal layer VDDL-3 may be provided in the same layer as the gateelectrode GE of the driving transistor T provided in the display areaDA. The third metal layer VDDL-3 may be made of the same material asthat of the gate electrode GE of the driving transistor T and may beformed simultaneously with the gate electrode GE.

The third metal layer VDDL-3 of the third pixel power line VDDL may beconnected to the second metal layer VDDL-2 of the third pixel power lineVDDL at one end through the first metal layer VDDL-1. In this case, thethird metal layer VDDL-3 of the third pixel power line VDDL may beconnected to the first metal layer VDDL-1 through a fifth contact holeCH5 that passes through the first and second inter-layer insulatinglayers ILD1 and ILD2. The first metal layer VDDL-1 may be connected tothe second metal layer VDDL-2 of the third pixel power line VDDL througha sixth contact hole CH6 that passes through the first planarizationlayer PLN1. Therefore, the third metal layer VDDL-3 of the third pixelpower line VDDL may electrically be connected with the second metallayer VDDL-2 of the third pixel power line VDDL.

Also, the third metal layer VDDL-3 of the third pixel power line VDDLmay be connected to the first metal layer VDD1-1 of the first pixelpower line VDD1 at the other end through a seventh contact hole CH7 thatpasses through the first and second inter-layer insulating layers ILD1and ILD2.

Meanwhile, the third metal layer VDDL-3 of the third pixel power lineVDDL may be formed as one line pattern but is not limited thereto. Thethird metal layer VDDL-3 of the third pixel power line VDDL may includea plurality of line patterns. In this case, the third metal layer VDDL-3of the third pixel power line VDDL may electrically be connected withthe plurality of line patterns through the metal layer provided overanother layer, for example, the first metal layer VDDL-1.

Referring to FIGS. 2, 5 and 7 , the first common power line VSS1 may beprovided to be extended in the first non-display area NDA1, specificallybetween the first pixel power line VDD1 and the display area DA in afirst direction (e.g., X axis direction). The first common power lineVSS1 may be connected with the second pad VSSP in the first non-displayarea NDA1, and may be supplied with a second power source from thesecond pad VSSP. Also, the first common power line VSS1 may be connectedwith the plurality of third common power lines VSSL disposed in thedisplay area DA, and may supply the second power source to the cathodeelectrode 140 of the subpixels P1, P2 and P3 through the plurality ofthird common power lines VSSL.

The first common power line VSS1 may be made of a plurality of metallayers. For example, the first common power line VSS1, as shown in FIG.7 , may include a first metal layer VSS1-1 and a second metal layerVSS1-2 provided over the first metal layer VSS1-1. The first metal layerVSS1-1 and the second metal layer VSS1-2 may partially be overlappedwith each other, and may be connected with each other through a fifthcontact part CT5.

In some embodiments, the first metal layer VSS1-1 of the first commonpower line VSS1 may be provided in the same layer as the sourceelectrode SE and the drain electrode DE of the driving transistor Tprovided in the display area DA. The first metal layer VSS1-1 may bemade of the same material as that of the source electrode SE and thedrain electrode DE of the driving transistor T and may be formedsimultaneously with them.

The second metal layer VSS1-2 of the first common power line VSS1 may beprovided in the same layer as the anode auxiliary electrode 115 providedin the display area DA. The second metal layer VSS1-2 may be made of thesame material as that of the anode auxiliary electrode 115 and may beformed simultaneously with the anode auxiliary electrode 115.

In this case, the second metal layer VSS1-2 of the first common powerline VSS1 may be connected to the first metal layer VSS1-1 through thefifth contact part CT5 that passes through the first planarization layerPLN1. The fifth contact part CT5 may partially remove the firstplanarization layer PLN1 and partially expose the upper surface of thefirst metal layer VSS1-1 of the first common power line VSS1. In someembodiments, the fifth contact part CT5 may expose the upper surface ofthe first metal layer VSS1-1 of the first common power line VSS1 alongthe first direction (e.g., X axis direction). The second metal layerVSS1-2 of the first common power line VSS1 may directly in contact withthe exposed upper surface of the first metal layer VSS1-1 of the firstcommon power line VSS1. As a result, the second metal layer VSS1-2 ofthe first common power line VSS1 may have a wide contact area with thefirst metal layer VSS1-1 of the first common power line VSS1, therebybeing stably connected to the first metal layer VSS1-1.

In the transparent display panel 110 according to one embodiment of thepresent disclosure, as the first common power line VSS1 provided in thenon-display area NDA is provided as a double layer, a total area of thefirst common power line VSS1 may be increased, whereby resistance of thefirst common power line VSS1 may be reduced.

Meanwhile, the first common power line VSS1 may electrically beconnected with the second pad VSSP provided in the pad area PA. In someembodiments, the first pixel power line VDD1 and the first referenceline VREF1 may be provided between the first common power line VSS1 andthe second pad VSSP. If the first common power line VSS1 is formed inthe same layer as the first pixel power line VDD1 and the firstreference line VREF1, the first common power line VSS1 and the secondpad VSSP cannot be formed in the same layer in a single body.

The transparent display panel 110 according to one embodiment of thepresent disclosure may electrically connect the first common power lineVSS1 with the second pad VSSP by using a plurality of connectionelectrodes disposed on different layers.

In detail, the transparent display panel 110 according to one embodimentof the present disclosure may electrically connect the first commonpower line VSS1 with the second pad VSSP by using a first common powerconnection electrode 180 and a second common power connection electrode185, which are disposed on their respective layers different from eachother.

The first common power connection electrode 180 is provided in the firstnon-display area NDA1. The first common power connection electrode 180is provided between the first common power line VSS1 and the firstsubstrate 111, and electrically connects the first common power lineVSS1 with the second pad VSSP.

For example, the first common power connection electrode 180 may beprovided in the same layer as the gate electrode GE of the drivingtransistor T provided in the display area DA. Also, the first commonpower connection electrode 180 may be made of the same material as thatof the gate electrode GE of the driving transistor T and may be formedsimultaneously with the gate electrode GE.

One end of the first common power connection electrode 180 may beconnected to the first common power line VSS1 and the other end of thefirst common power connection electrode 180 may be connected to thesecond pad VSSP. In detail, the first common power connection electrode180 may be connected to the first metal layer VSS1-1 of the first commonpower line VSS1 at one end through an eighth contact hole CH8 thatpasses through the first and second inter-layer insulating layers ILD1and ILD2. Also, the first common power connection electrode 180 may beconnected to the second pad VSSP at the other end through a ninthcontact hole CH9 that passes through the first and second inter-layerinsulating layers ILD1 and ILD2.

Meanwhile, the first common power connection electrode 180 may be formedbetween the second pad VSSP and the first common power line VSS1 as oneelectrode but is not limited thereto. The first common power connectionelectrode 180 may include a plurality of electrodes.

For example, the first common power connection electrode 180, as shownin FIG. 7 , may include one first common power connection electrode 181,another first common power connection electrode 182, and other firstcommon power connection electrode 183.

One first common power connection electrode 181 may be connected to thefirst common power line VSS1 through the eighth contact hole CH8, andanother first common power connection electrode 182 may be connected tothe second pad VSSP through the ninth contact hole CH9. One first commonpower connection electrode 181 and another first common power connectionelectrode 182 may be provided in the same layer as the gate electrode GEof the driving transistor T.

One end of the other first common power connection electrode 183provided over a layer different from one first common power connectionelectrode 181 and another first common power connection electrode 182may be connected to the first common power connection electrode 181through a tenth contact hole CH10, and the other end thereof may beconnected to the first common power connection electrode 182 through aneleventh contact hole CH11. In some embodiments, the other first commonpower connection electrode 183 may be provided in the same layer as thesource electrode SE and the drain electrode DE of the driving transistorT.

The second common power connection electrode 185 may be provided in thefirst non-display area NDA1, and may partially be overlapped with thefirst common power connection electrode 180. Also, the second commonpower connection electrode 185 is provided over the first common powerline VSS1, and electrically connects the first common power line VSS1with the second pad VSSP.

For example, the second common power connection electrode 185 may beprovided in the same layer as the anode electrode 120 of the lightemitting diode provided in the display area DA. Also, the second commonpower connection electrode 185 may be made of the same material as thatof the anode electrode 120 of the light emitting diode and may be formedsimultaneously with the anode electrode 120.

One end of the second common power connection electrode 185 may beconnected to the first common power line VSS1, and the other end of thesecond common power connection electrode 185 may be connected to thesecond pad VSSP. In detail, the second common power connection electrode185 may be connected to the second metal layer VSS1-2 of the firstcommon power line VSS1 at one end through a first contact part CT1. Thefirst contact part CT1 may partially remove the second planarizationlayer PLN2 and partially expose the upper surface of the second metallayer VSS1-2 of the first common power line VSS1. In some embodiments,the first contact part CT1 may expose the upper surface of the secondmetal layer VSS1-2 of the first common power line VSS1 along the firstdirection (e.g., X axis direction). The second common power connectionelectrode 185 may directly in contact with the exposed upper surface ofthe first common power line VSS1. As a result, the second common powerconnection electrode 185 may have a wide contact area with the firstcommon power line VSS1, thereby being stably connected to the firstcommon power line VSS1. Meanwhile, at least a part of the first contactpart CT1 may be formed to overlap the fifth contact part CT5.

The second common power connection electrode 185 may be connected to thesecond pad VSSP at the other end through a second contact part CT2. Thesecond contact part CT2 may partially remove the first planarizationlayer PLN1 and partially expose the upper surface of the second padVSSP. The second pad VSSP, as shown in FIG. 2 , may include a pluralityof pad parts. In some embodiments, two pad parts disposed to adjoin eachother may be connected with each other through a pad connectionelectrode PC. The second contact part CT2 may expose the upper surfaceof the second pad VSSP connected by the pad connection electrode PCalong the first direction (e.g., X axis direction). The second commonpower connection electrode 185 may directly in contact with the exposedupper surface of the second pad VSSP. As a result, the second commonpower connection electrode 185 may have a wide contact area with thesecond pad VSSP, thereby being stably connected to the second pad VSSP.

Also, the second common power connection electrode 185 may electricallybe connected with the cathode electrode 140 through a cathode contactpart CCT in the first non-display area NDA1. The cathode contact partCCT may partially remove the bank 125 and partially expose the uppersurface of the second common power connection electrode 185. The cathodecontact part CCT may expose the upper surface of the second common powerconnection electrode 185 along the first direction (e.g., X axisdirection). As a result, the second common power connection electrode185 may have a wide contact area with the cathode electrode 140, therebybeing stably connected to the cathode electrode 140.

Consequently, the first common power line VSS1 may electrically beconnected with the cathode electrode 140 through the second common powerconnection electrode 185. Therefore, the first common power line VSS1may supply the second power source forwarded from the second pad VSSP tothe cathode electrode 140.

The transparent display panel 110 according to one embodiment of thepresent disclosure may electrically connect the first common power lineVSS1 and the second pad VSSP, which are disposed in the firstnon-display area NDA1, with each other by using the first common powerconnection electrode 180 and the second common power connectionelectrode 185 disposed on their respective layers different from eachother. In some embodiments, the first common power connection electrodemay be provided below the first common power line VSS1 and the secondpad VSSP, and the second common power connection electrode may beprovided over the first common power line VSS1 and the second pad VSSP.

Therefore, the transparent display panel 110 according to one embodimentof the present disclosure may increase a total area of the common powerline VSS, whereby resistance of the common power line VSS may bereduced.

Also, in the transparent display panel 110 according to one embodimentof the present disclosure, even though a defect occurs in any one of thefirst common power connection electrode 180 and the second common powerconnection electrode 185, the first common power line VSS1 and thesecond pad VSSP may be connected with each other by the other one.Therefore, since the transparent display panel 110 according to oneembodiment of the present disclosure may stably supply the first powersource to the subpixels P1, P2 and P3, panel yield may be improved.

The third common power line VSSL is provided between the transmissiveareas TA in the display area DA. In some embodiments, the transparentdisplay panel 110 according to one embodiment of the present disclosuremay reduce or minimize the non-transmissive area NTA in the display areaDA by alternately disposing the third common power line VSSL and thethird pixel power line VDDL between the transmissive areas TA.Therefore, the transparent display panel 110 according to one embodimentof the present disclosure may enhance transmittance by increasing thetransmissive area TA.

Meanwhile, the third common power line VSSL may be extended in thedisplay area DA in a second direction (e.g., Y axis direction), and thusits one end may be connected with the first common power line VSS1 andits other end may be connected with the second common power line VSS2.For example, the third common power line VSSL and the first common powerline VSS1, as shown in FIG. 7 , may be provided in the same layer, andmay be connected with each other without being spaced apart from eachother.

Referring to FIGS. 2, 5 and 8 , the first reference line VREF1 may beprovided to be extended in the first non-display area NDA1, specificallybetween the first pixel power line VDD1 and the first common power lineVSS1 in a first direction (e.g., X axis direction). The first referenceline VREF1 may be connected with the third pad VREFP in the firstnon-display area NDA1, and may be supplied with the initializationvoltage (or sensing voltage) from the third pad VREFP. Also, the firstreference line VREF1 may be connected with the plurality of secondreference lines VREFL disposed in the display area DA, and may supplythe initialization voltage (or sensing voltage) to the transistor T ofeach of the subpixels P1, P2 and P3 through the plurality of secondreference lines VREFL.

The first reference line VREF1 may be made of a plurality of metallayers. For example, the first reference line VREF1, as shown in FIG. 8, may include a first metal layer VREF1-1 and a second metal layerVREF1-2 provided over the first metal layer VREF1-1. The first metallayer VREF1-1 and the second metal layer VREF1-2 may partially beoverlapped with each other, and may be connected with each other througha twelfth contact hole CH12.

In some embodiments, the first metal layer VREF1-1 of the firstreference line VREF1 may be provided in the same layer as the sourceelectrode SE and the drain electrode DE of the driving transistor Tprovided in the display area DA. The first metal layer VREF1-1 may bemade of the same material as that of the source electrode SE and thedrain electrode DE of the driving transistor T and may be formedsimultaneously with them.

The second metal layer VREF1-2 of the first reference line VREF1 may beprovided in the same layer as the anode auxiliary electrode 115 providedin the display area DA. The second metal layer VREF1-2 may be made ofthe same material as the anode auxiliary electrode 115 and may be formedsimultaneously with the anode auxiliary electrode 115. In this case, thesecond metal layer VREF1-2 of the first reference line VREF1 may beconnected to the first metal layer VREF1-1 through the twelfth contacthole CH12 that passes through the first planarization layer PLN1.

In the transparent display panel 110 according to one embodiment of thepresent disclosure, as the first reference line VREF1 provided in thenon-display area NDA is provided as a double layer, a total area of thefirst reference line VREF1 may be increased, whereby resistance of thefirst reference line VREF1 may be reduced.

Meanwhile, the first reference line VREF1 may electrically be connectedwith the third pad VREFP provided in the pad area PA. In someembodiments, the first pixel power line VDD1 may be provided between thefirst reference line VREF1 and the third pad VREFP. If the firstreference line VREF1 is formed in the same layer as the first pixelpower line VDD1, the first reference line VREF1 and the third pad VREFPcannot be formed in the same layer in a single body.

The transparent display panel 110 according to one embodiment of thepresent disclosure may electrically connect the first reference lineVREF1 with the third pad VREFP by using a plurality of connectionelectrodes disposed over different layers.

In detail, the transparent display panel 110 according to one embodimentof the present disclosure may electrically connect the first referenceline VREF1 with the third pad VREFP by using a first referenceconnection electrode 190 and a second reference connection electrode195, which are disposed on their respective layers different from eachother.

The first reference connection electrode 190 is provided in the firstnon-display area NDA1. The first reference connection electrode 190 isprovided between the first reference line VREF1 and the first substrate111, and electrically connects the first reference line VREF1 with thethird pad VREFP.

For example, the first reference connection electrode 190 may beprovided in the same layer as the gate electrode GE of the drivingtransistor T provided in the display area DA. Also, the first referenceconnection electrode 190 may be made of the same material as that of thegate electrode GE of the driving transistor T and may be formedsimultaneously with the gate electrode GE.

One end of the first reference connection electrode 190 may be connectedto the first reference line VREF1 and the other end of the firstreference connection electrode 190 may be connected to the third padVREFP. In detail, the first reference connection electrode 190 may beconnected to the first metal layer VREF1-1 of the first reference lineVREF1 at one end through a thirteenth contact hole CH13 that passesthrough the first and second inter-layer insulating layers ILD1 andILD2. Also, the first reference connection electrode 190 may beconnected to the third pad VREFP at the other end through a fourteenthcontact hole CH14 that passes through the first and second inter-layerinsulating layers ILD1 and ILD2.

Meanwhile, the first reference connection electrode 190 may be formedbetween the first reference line VREF1 and the third pad VREFP as oneelectrode but is not limited thereto. The first reference connectionelectrode 190 may include a plurality of electrodes.

The second reference connection electrode 195 may be provided in thefirst non-display area NDA1. At least a part of the second referenceconnection electrode 195 may be overlapped with the first referenceconnection electrode 190. The second reference connection electrode 195is provided over the first reference line VREF1, and electricallyconnects the first reference line VREF1 with the third pad VREFP.

For example, the second reference connection electrode 195 may beprovided in the same layer as the anode electrode 120 of the lightemitting diode provided in the display area DA. Also, the secondreference connection electrode 195 may be made of the same material asthat of the anode electrode 120 of the light emitting diode and may beformed simultaneously with the anode electrode 120.

One end of the second reference connection electrode 195 may beconnected to the first reference line VREF1 and the other end thereofmay be connected to the third pad VREFP. In detail, the second referenceconnection electrode 195 may be connected to the second metal layerVREF1-2 of the first reference line VREF1 at one end through a thirdcontact part CT3. The third contact part CT3 may partially remove thesecond planarization layer PLN2 and partially expose the upper surfaceof the second metal layer VREF1-2 of the first reference line VREF1. Insome embodiments, the third contact part CT3 may expose the uppersurface of the second metal layer VREF1-2 of the first reference lineVREF1 along the first direction (e.g., X axis direction). As a result,the second reference connection electrode 195 may have a wide contactarea with the first reference line VREF1, thereby being stably connectedto the first reference line VREF1.

The second reference connection electrode 195 may be connected to thethird pad VREFP at the other end through a fourth contact part CT4. Thefourth contact part CT4 may partially remove the first planarizationlayer PLN1 and partially expose the upper surface of the third padVREFP. In some embodiments, the fourth contact portion CT4 may exposethe upper surface of the third pad VREFP along the first direction(e.g., X axis direction). The second reference connection electrode 195may directly in contact with the exposed upper surface of the third padVREFP. As a result, the second reference connection electrode 195 mayhave a wide contact area with the third pad VREFP, thereby being stablyconnected to the third pad VREFP.

The second reference connection electrode 195 is formed in the samelayer as the second common power connection electrode 185 but is spacedapart from the second common power connection electrode 185. Therefore,the second reference connection electrode 195 is not electricallyconnected with the second common power connection electrode 185.

The transparent display panel 110 according to one embodiment of thepresent disclosure may connect the first reference line VREF1 and thethird pad VREFP, which are disposed in the first non-display area NDA1,with each other by using the first reference connection electrode 190and the second reference connection electrode 195 disposed on theirrespective layers different from each other. In some embodiments, thefirst reference connection electrode 190 may be provided below the firstreference line VREF1 and the third pad VREFP, and the second referenceconnection electrode 195 may be provided over the first reference lineVREF1 and the third pad VREFP.

Therefore, the transparent display panel 110 according to one embodimentof the present disclosure may increase a total area of the firstreference line VREF1, whereby resistance of the first reference lineVREF1 may be reduced.

Also, in the transparent display panel 110 according to one embodimentof the present disclosure, even though a defect occurs in any one of thefirst reference connection electrode 190 and the second referenceconnection electrode 195, the first reference line VREF1 and the thirdpad VREFP may be connected with each other by the other one. Therefore,since the transparent display panel 110 according to one embodiment ofthe present disclosure may stably supply the initialization voltage (orsensing voltage) to the subpixels P1, P2 and P3, panel yield may beimproved.

Also, the transparent display panel 110 according to one embodiment ofthe present disclosure may test a defect of the driving transistor Tbefore the anode electrode 120 is deposited.

The transparent display panel 110 may connect the first common powerline VSS1 with the second pad VSSP by using only the second common powerconnection electrode 185 provided in the same layer as the anodeelectrode 120. Also, the transparent display panel 110 may connect thefirst reference line VREF1 with the third pad VREFP by using only thesecond reference connection electrode 195 provided in the same layer asthe anode electrode 120.

In this case, a process of testing a defect of the driving transistor Thas no choice but to be performed after the anode electrode 120 isdeposited. If a defect occurs in the driving transistor T, a repairprocess may be performed to repair a portion where the defect hasoccurred. In some embodiments, the layers deposited on the layer wherethe defect has occurred should be removed to perform the repair process.For example, if the defect occurs in the layer provided with the anodeauxiliary electrode 115, the second planarization layer PLN2 and theanode electrode 120 should be removed for the repair process. In someembodiments, luminescence may not be performed in the correspondingarea.

In this way, if the repair process is performed after the anodeelectrode 120 is formed, repair yield is reduced due to the anodeelectrode 120 and the second planarization layer PLN2 provided over theanode auxiliary electrode 115, and a tact time is increased.

The transparent display panel 110 according to one embodiment of thepresent disclosure may connect the first common power line VSS1 with thesecond pad VSSP by using the first common power connection electrode 180and the second common power connection electrode 185. Also, thetransparent display panel 110 according to one embodiment of the presentdisclosure may connect the first common power line VSS1 with the secondpad VSSP through the first common power connection electrode 180 eventhough the second common power connection electrode 185 is not formed.

The transparent display panel 110 according to one embodiment of thepresent disclosure may connect the first reference line VREF1 with thethird pad VREFP by using the first reference connection electrode 190and the second reference connection electrode 195. Also, the transparentdisplay panel 110 according to one embodiment of the present disclosuremay connect the first reference line VREF1 with the third pad VREFPthrough the first reference connection electrode 190 even though thesecond reference connection electrode 195 is not formed.

Therefore, the transparent display panel 110 according to one embodimentof the present disclosure may test a defect of the driving transistor Tbefore the anode electrode 120 is deposited. That is, since the repairprocess is performed before the second planarization layer PLN2 and theanode electrode 120 are deposited, the transparent display panel 110according to one embodiment of the present disclosure may prevent repairyield from being reduced due to the second planarization layer PLN2 andthe anode electrode 120. In addition, the transparent display panel 110according to one embodiment of the present disclosure may reduce a tacttime.

Hereinafter, the second pixel power line VDD2 and the second commonpower line VSS2 provided in the second non-display area NDA2 will bedescribed in more detail with reference to FIGS. 9 to 13 .

FIG. 9 is an enlarged view of an area C in FIG. 2 , FIG. 10 is across-sectional view taken along line V-V′ of FIG. 9 , FIG. 11 is across-sectional view taken along line VI-VI′ of FIG. 9 , FIG. 12 is across-sectional view taken along line VII-VII′ of FIG. 9 , and FIG. 13is a cross-sectional view illustrating a modified example of FIG. 11 .

The display area DA, as shown in FIG. 3 , may include firstnon-transmissive areas NTA1, and first transmissive areas TA1 providedbetween the first non-transmissive areas NTA1. The first transmissivearea TA1 is an area through which most of externally incident lightpasses, and the first non-transmissive area NTA1 is an area throughwhich most of externally incident light fails to transmit.

The first non-transmissive area NTA1 may be provided with third pixelpower lines VDDL, third common power lines VSSL, reference lines, datalines, gate lines GL, and pixels P1, P2 and P3.

The gate lines GL may be extended in a first direction (e.g., X axisdirection), and may cross the third pixel power lines VDDL, the thirdcommon power lines VSSL and the data lines in the display area DA.

The third pixel power lines VDDL, the third common power lines VSSL, andthe data lines may be extended in a second direction (e.g., Y axisdirection). In some embodiments, the third pixel power lines VDDL andthe third common power lines VSSL may alternately be disposed in thedisplay area DA. The first transmissive area TA1 may be disposed betweenthe third pixel power line VDDL and the third common power line VSSL.

The second non-display area NDA2 may include second non-transmissiveareas NTA2, and second transmissive areas TA2 provided between thesecond non-transmissive areas NTA2. The second transmissive area TA2 isan area through which most of externally incident light passes as it is,and the second non-transmissive area NTA2 is an area through which mostof externally incident light fails to transmit.

The second non-transmissive area NTA2 may be provided with second pixelpower lines VDD2, second common power lines VSS2, third pixel powerlines VDDL and third common power lines VSSL.

The second pixel power line VDD2 may be extended from the secondnon-display area NDA2 in a first direction (e.g., X axis direction). Thesecond pixel power line VDD2 may be provided in the second non-displayarea NDA2 in a plural number. The number of second pixel power linesVDD2 may be, but not limited to, 2 as shown in FIG. 9 . The number ofsecond pixel power lines VDD2 may be three or more.

One second pixel power line VDD21 is disposed to be spaced apart fromthe other second pixel power line VDD22. In some embodiments, the secondtransmissive area TA2 may be provided between one second pixel powerline VDD21 and the other second pixel power line VDD22.

The second transmissive area TA2 provided between one second pixel powerline VDD21 and the other second pixel power line VDD22 may substantiallyhave the same shape as that of the first transmissive area TA1 providedin the display area DA. In this case, the substantially same shape meansthat shapes on a plane have the same property. Sizes or rates of theshapes may be equal (or substantially equal) to or different from eachother.

For example, the first transmissive area TA1 provided in the displayarea DA may have a rectangular shape, and may have a rounded corner butis not limited thereto. In this case, the second transmissive area TA2may also have a rectangular shape, and may have a rounded corner.

In the second non-transmissive area NTA2 provided with one second pixelpower line VDD21 and the other second pixel power line VDD22, a width W2in a second direction transverse to a first direction may be equal (orsubstantially equal) to a width W1 in a second direction of the firstnon-transmissive area NTA1 provided in the display area DA. In someembodiments, the second direction is perpendicular to the firstdirection.

Each of one second pixel power line VDD21 and the other second pixelpower line VDD22 may be disposed in the second non-transmissive areaNTA2. Therefore, as shown in FIG. 9 , each of one second pixel powerline VDD21 and the other second pixel power line VDD22 may have a widthW3 equal (or substantially equal) to the width W2 of the secondnon-transmissive area NTA2 or a width W3 narrower than the width W2 ofthe second non-transmissive area NTA2.

Consequently, the plurality of second pixel power lines VDD2 disposed inthe second non-display area NDA2 may have a width W3 equal (orsubstantially equal) to the width W1 in the second direction of thefirst non-transmissive area NTA1 provided in the display area DA or awidth W3 narrower than the width W1 in the second direction of the firstnon-transmissive area NTA1.

In the transparent display panel 110 according to one embodiment of thepresent disclosure, the second pixel power line VDD2 provided in thesecond non-display area NDA2 does not have a wide width. In thetransparent display panel 110 according to one embodiment of the presentdisclosure, the width W3 of the second pixel power line VDD2 may beformed to be equal (or substantially equal) to or narrower than thewidth W1 of the first non-transmissive area NTA1 provided in the displayarea DA, whereby the wide second transmissive area TA2 may be obtainedin the second non-display area NDA2.

Meanwhile, in the transparent display panel 110 according to oneembodiment of the present disclosure, the second pixel power line VDD2may be formed in a plural al number, whereby a total area of the secondpixel power line VDD2 may be increased.

Moreover, in the transparent display panel 110 according to oneembodiment of the present disclosure, the second pixel power line VDD2may be formed of a plurality of metal layers to increase its total area.

In detail, the second pixel power line VDD2 may be provided with aplurality of metal layers. For example, the second pixel power lineVDD2, as shown in FIG. 10 , may include a first metal layer VDD2-1 and asecond metal layer VDD2-2 provided over the first metal layer VDD2-1.The first metal layer VDD2-1 and the second metal layer VDD2-2 maypartially be overlapped with each other, and may be connected with eachother through a fifteenth contact hole CH15.

In some embodiments, the first metal layer VDD2-1 of the second pixelpower line VDD2 may be made of an opaque metal material of lowresistance. For example, the first metal layer VDD2-1 of the secondpixel power line VDD2 may be provided on the same layer as the sourceelectrode SE and the drain electrode DE of the driving transistor Tprovided in the display area DA. The first metal layer VDD2-1 may bemade of the same material as that of the source electrode SE and thedrain electrode DE of the driving transistor T and may be formedsimultaneously with them.

The second metal layer VDD2-2 of the second pixel power line VDD2 may bemade of an opaque metal material of low resistance. For example, thesecond metal layer VDD2-2 of the second pixel power line VDD2 may beprovided on the same layer as the anode auxiliary electrode 115 providedin the display area DA. The second metal layer VDD2-2 may be made of thesame material as that of the anode auxiliary electrode 115 and may beformed simultaneously with the anode auxiliary electrode 115. In thiscase, the second metal layer VDD2-2 of the second pixel power line VDD2may be connected to the first metal layer VDD2-1 through a plurality offifteenth contact holes CH15 that pass through the first planarizationfilm PLN1.

In the transparent display panel 110 according to one embodiment of thepresent disclosure, as each of the plurality of second pixel power linesVDD2 provided in the second non-display area NDA2 is provided with adouble layer, a total area of the second pixel power line VDD2 may beincreased. Therefore, in the transparent display panel 110 according toone embodiment of the present disclosure, even though the width W3 ofthe second pixel power line VDD2 is formed to be narrow, wherebyresistance of the second pixel power line VDD2 may be prevented frombeing increased.

Also, in the transparent display panel 110 according to one embodimentof the present disclosure, as the second metal layer VDD2-2 of thesecond pixel power line VDD2 may be connected to the first metal layerVDD2-1 of the second pixel power line VDD2 through the plurality offifteenth contact holes CH15, the first metal layer VDD2-1 and thesecond metal layer VDD2-2 may stably be connected with each other.

Each of the third pixel power lines VDDL may be extended from thedisplay area DA in a second direction (e.g., Y axis direction) andconnected with the second pixel power line VDD2. The third pixel powerline VDDL may be connected to one second pixel power line VDD21 and theother second pixel power line VDD22. In detail, each of the third pixelpower lines VDDL may be extended from the display area DA in a seconddirection (e.g., Y axis direction), and thus may be connected with oneend of one second pixel power line VDD21. Also, each of the third pixelpower lines VDDL may be extended from the other end of one second pixelpower line VDD21 in a second direction (e.g., Y axis direction), andthus may be connected with one end of the other second pixel power lineVDD22. Therefore, one second pixel power line VDD21, the other secondpixel power line VDD22 and the third pixel power lines VDDL mayelectrically be connected with one another.

The third pixel power lines VDDL may be formed on the same layer as thesecond pixel power line VDD2 in the second non-display area NDA2. Indetail, the third pixel power line VDDL may include a first metal layerVDDL-1 and a second metal layer VDDL-2 in the second non-display areaNDA2. The first metal layer VDDL-1 of the third pixel power line VDDLmay be extended from the first metal layer VDD2-1 of the second pixelpower line VDD2, and the second metal layer VDDL-2 of the third pixelpower line VDDL may be extended from the second metal layer VDD2-2 ofthe second pixel power line VDD2.

The third pixel power lines VDDL may be extended from the display areaDA to only an upper layer VDDL-2.

The second common power line VSS2 may be extended from the secondnon-display area NDA2 in a first direction (e.g., X axis direction). Thesecond common power line VSS2 may be provided in the second non-displayarea NDA2 in a plural number. The number of second common power linesVSS2 may be, but not limited to, 2 as shown in FIG. 9 . The number ofsecond common power lines VSS2 may be three or more.

One second common power line VSS21 is disposed to be spaced apart fromthe other second common power line VSS22. In some embodiments, thesecond transmissive area TA2 may be provided between one second commonpower line VSS21 and the other second common power line VSS22.

The second transmissive area TA2 provided between one second commonpower line VSS21 and the other second common power line VSS22 maysubstantially have the same shape as that of the first transmissive areaTA1 provided in the display area DA. In this case, the substantiallysame shape means that shapes on a plane have the same property. Sizes orrates of the shapes may be equal (or substantially equal) to ordifferent from each other.

For example, the first transmissive area TA1 provided in the displayarea DA may have a rectangular shape, and may have a rounded corner butis not limited thereto. In this case, the second transmissive area TA2may also have a rectangular shape, and may have a rounded corner.

In the second non-transmissive area NTA2 provided with one second commonpower line VSS21 and the other second common power line VSS22, a widthW4 in a second direction perpendicular to a first direction may be equal(or substantially equal) to the width W1 in a second direction of thefirst non-transmissive area NTA1 provided in the display area DA.

Each of one second common power line VSS21 and the other second commonpower line VSS22 may be disposed in the second non-transmissive areaNTA2. Therefore, as shown in FIG. 9 , each of one second common powerline VSS21 and the other second common power line VSS22 may have a widthW5 equal (or substantially equal) to the width W4 of the secondnon-transmissive area NTA2 or a width W5 narrower than the width W4 ofthe second non-transmissive area NTA2.

Consequently, the plurality of second common power lines VSS2 disposedin the second non-display area NDA2 may have a width W5 equal (orsubstantially equal) to the width W1 in the second direction of thefirst non-transmissive area NTA1 provided in the display area DA or awidth W5 narrower than the width W1 in the second direction of the firstnon-transmissive area NTA1.

In the transparent display panel 110 according to one embodiment of thepresent disclosure, the second common power line VSS2 provided in thesecond non-display area NDA2 does not have a wide width. In thetransparent display panel 110 according to one embodiment of the presentdisclosure, the width W5 of the second common power line VSS2 may beformed to be equal (or substantially equal) to or narrower than thewidth W1 of the first non-transmissive area NTA1 provided in the displayarea DA, whereby the wide second transmissive area TA2 may be obtainedin the second non-display area NDA2.

Meanwhile, in the transparent display panel 110 according to oneembodiment of the present disclosure, the second common power line VSS2may be formed in a plural al number, whereby a total area of the secondcommon power line VSS2 may be increased.

Moreover, in the transparent display panel 110 according to oneembodiment of the present disclosure, the second common power line VSS2may be formed of a plurality of metal layers to increase its total area.

In detail, the second common power line VSS2 may be provided with aplurality of metal layers. For example, the second common power lineVSS2, as shown in FIG. 11 , may include a first metal layer VSS2-1 and asecond metal layer VSS2-2 provided over the first metal layer VSS2-1.The second common power lines VSS2 may further include a third metallayer VSS2-3 provided over the second metal layer VSS2-2. The firstmetal layer VSS2-1 and the second metal layer VSS2-2 may partially beoverlapped with each other, and may be connected with each other througha sixteenth contact hole CH16. At least a part of the third metal layerVSS2-3 may be overlapped with the second metal layer VSS2-2, and maydirectly be adjacent onto the second metal layer VSS2-2.

In some embodiments, the first metal layer VSS2-1 of the second commonpower line VSS2 may be made of an opaque metal material of lowresistance. For example, the second metal layer VSS2-1 of the secondcommon power line VSS2 may be provided on the same layer as the sourceelectrode SE and the drain electrode DE of the driving transistor Tprovided in the display area DA. The first metal layer VSS2-1 may bemade of the same material as that of the source electrode SE and thedrain electrode DE of the driving transistor T and may be formedsimultaneously with them.

The second metal layer VSS2-2 of the second common power line VSS2 maybe made of an opaque metal material of low resistance. For example, thesecond metal layer VSS2-2 of the second common power line VSS2 may beprovided on the same layer as the anode auxiliary electrode 115 providedin the display area DA. The second metal layer VSS2-2 may be made of thesame material as that of the anode auxiliary electrode 115 and may beformed simultaneously with the anode auxiliary electrode 115. In thiscase, the second metal layer VSS2-2 of the second common power line VSS2may be connected to the first metal layer VSS2-1 through a plurality ofsixteenth contact holes CH16 that pass through the first planarizationfilm PLN1.

The third metal layer VSS2-3 of the second common power line VSS2 may bemade of an opaque metal material of low resistance. For example, thethird metal layer VSS2-3 of the second common power line VSS2 may beprovided on the same layer as the anode electrode 120 provided in thedisplay area DA. The third metal layer VSS2-3 may be made of the samematerial as that of the anode electrode 120 and may be formedsimultaneously with the anode electrode 120.

In the transparent display panel 110 according to one embodiment of thepresent disclosure, as each of the plurality of second common powerlines VSS2 provided in the second non-display area NDA2 is provided witha plurality of layers, a total area of the second common power line VSS2may be increased. Therefore, in the transparent display panel 110according to one embodiment of the present disclosure, even though thewidth W5 of the second common power line VSS2 is formed to be narrow,whereby resistance of the second common power line VSS2 may be preventedfrom being increased.

Also, in the transparent display panel 110 according to one embodimentof the present disclosure, as the second metal layer VSS2-2 of thesecond common power line VSS2 may be connected to the first metal layerVSS2-1 of the second common power line VSS2 through the plurality ofsixteenth contact holes CH16, the first metal layer VSS2-1 and thesecond metal layer VSS2-2 may stably be connected with each other.

Meanwhile, each of the second common power lines VSS2 may electricallybe connected with the cathode electrode 140 through a cathode contactportion CCT. The cathode contact portion CCT may partially remove thebank 125 and partially expose the upper surface of the third metal layerVSS2-3 of the second common power lines VSS2. The cathode contactportion CCT may longitudinally expose the upper surface of the thirdmetal layer VSS2-3 of the second common power lines VSS2 along the firstdirection (e.g., X axis direction). As a result, the second common powerlines VSS2 may have a wide contact area with the cathode electrode 140,thereby being stably connected to the cathode electrode 140.

Each of the third common power lines VSSL may be extended from thedisplay area DA in a second direction (e.g., Y axis direction) andconnected with the second common power line VSS2. The third common powerline VSSL may be connected to one second common power line VSS21 and theother second common power line VSS22. In detail, each of the thirdcommon power lines VSSL may be extended from the display area DA in asecond direction (e.g., Y axis direction), and thus may be connectedwith one end of one second common power line VSS21. Also, each of thethird common power lines VSSL may be extended from the other end of onesecond common power line VSS21 in a second direction (e.g., Y axisdirection), and thus may be connected with one end of the other secondcommon power line VSS22. Therefore, one second common power line VSS21,the other second common power line VSS22 and the third common powerlines VSSL may electrically be connected with one another.

The third common power lines VSSL may be formed on the same layer as thesecond common power line VSS2 in the second non-display area NDA2. Indetail, the third common power line VSSL may include a first metal layerVSSL-1 and a second metal layer VSSL-2 in the second non-display areaNDA2. The first metal layer VSSL-1 of the third common power line VSSLmay be extended from the first metal layer VSS2-1 of the second commonpower line VSS2, and the second metal layer VSSL-2 of the third commonpower line VSSL may be extended from the second metal layer VSS2-2 ofthe second common power line VSS2.

The second pixel power lines VDD2 may be provided between the secondcommon power lines VSS2 and the display area DA as shown in FIG. 9 . Inthis case, the third common power lines VSSL may include one of thefirst metal layer VSSL-1 and the second metal layer VSSL-2 in the areaoverlapped with the second pixel power lines VDD2.

For example, the third common power lines VSSL may include only thefirst metal layer VSSL-1 of the first metal layer VSSL-1 and the secondmetal layer VSSL-2 in the area overlapped with the second pixel powerlines VDD2 as shown in FIG. 11 . In some embodiments, the second pixelpower lines VSSL may include only the second metal layer VDD2-2 of thefirst metal layer VDD2-1 and the second metal layer VDD2-2 in the areaoverlapped with the third common power lines VSSL.

Although FIG. 11 shows that the third common power lines VSSL includeany one of the first metal layer VSSL-1 and the second metal layerVSSL-2 in the area overlapped with the second pixel power lines VDD2,the present disclosure is not limited to the example of FIG. 11 .

In another embodiment, the third common power lines VSSL, as shown inFIG. 13 , may be connected in the area overlapped with the second pixelpower lines VDD2 by using the third metal layer VSSL-3 provided over alayer different from the first metal layer VSSL-1 and the second metallayer VSSL-2. The third metal layer VSSL-3 of the third common powerlines VSSL may be provided on the same layer as the gate electrode GE ofthe driving transistor T provided in the display area DA. The thirdmetal layer VSSL-3 may be made of the same material as that of the gateelectrode GE of the driving transistor T and may be formedsimultaneously with the gate electrode GE. In this case, the third metallayer VSSL-3 of the third common power lines VSSL may be connected tothe first metal layer VSSL-1 through a plurality of a seventeenthcontact hole CH17 that passes through the first and second inter-layerinsulating layers ILD1 and ILD2.

In the transparent display panel 110 according to one embodiment of thepresent disclosure, the second common power line VSS2 may be formed in aplural number, and the plurality of second common power lines VSS2 maybe spaced apart from one another to form the second transmissive areaTA2. Also, in the transparent display panel 110 according to oneembodiment of the present disclosure, the second pixel power line VDD2may be formed in a plural number, and the plurality of second pixelpower lines VDD2 may be spaced apart from one another to form the secondtransmissive area TA2. Therefore, in the transparent display panel 110according to one embodiment of the present disclosure, since the secondtransmissive area TA2 is also provided in the non-display area NDA2 likethe display area DA, transmittance in the second non-display area NDA2may be improved.

The transparent display panel 110 according to one embodiment of thepresent disclosure may have similar transmittance in the secondnon-display area NDA2 and the display area DA common power line VSS2.Accordingly, in some embodiments, in the transparent display panel 110according to one embodiment of the present disclosure, an area of thefirst transmissive area TA1 provided in a unit area and an area of thesecond transmissive area TA2 provided in a unit area may be designed tobe equal or substantially equal to each other.

In detail, in one embodiment, the second transmissive area TA2 providedin the second non-display area NDA2 may have the same or substantiallythe same shape as that of the first transmissive area TA1 provided inthe display area DA.

Also, in the transparent display panel 110 according to one embodimentof the present disclosure, a width W7 in the first direction (e.g., Xaxis direction) of the second transmissive area TA2 provided in thesecond non-display area NDA2 may be equal (or substantially equal) to awidth W6 in the first direction (e.g., X axis direction) of the firsttransmissive area TA1. This is because that a spaced distance betweenthe third pixel power line VDDL and the third common power line VSSL inthe second non-display area NDA2 is equal (or substantially equal) to aspaced distance between the third pixel power line VDDL and the thirdcommon power line VSSL. The width in the first direction (e.g., X axisdirection) of the transmissive areas TA1 and TA2 may be determined bythe spaced distance between the third pixel power line VDDL and thethird common power line VSSL.

Also, in the transparent display panel 110 according to one embodimentof the present disclosure, a width W2 in the second direction (e.g., Yaxis direction) of the second non-transmissive area NTA2 provided in thesecond non-display area NDA2 may be equal (or substantially equal) tothe width W1 in the second direction (e.g., Y axis direction) of thefirst non-transmsisive area NTA1.

Therefore, in the transparent display panel 110 according to oneembodiment of the present disclosure, transmittance similar to that inthe display area DA may be embodied in the second non-display area NDA2.

Moreover, the transparent display panel 110 according to one embodimentof the present disclosure may further include a color filter layer 170and a black matrix BM in the second non-transmissive area NTA2 of thesecond non-display area NDA2.

In more detail, color filters CF1, CF2 and CF3 formed over the secondpixel power line VDD2, the second common power line VSS2, the thirdpixel power lines VDDL and the third common power lines VSSL, and theblack matrix BM formed among the color filters CF1, CF2 and CF3 may beprovided in the second non-transmissive area NTA2 of the secondnon-display area NDA2. In some embodiments, the color filters CF1, CF2and CF3 may be formed to be patterned in the second non-display areaNDA2 in the same shape as that of the color filters CF1, CF2 and CF3provided in the display area DA.

The color filter layer 170 and the black matrix BM may not be providedin the second transmissive area TA2 of the second non-display area NDA2as shown in FIG. 12 to enhance transmittance.

Therefore, in the transparent display panel 110 according to oneembodiment of the present disclosure, a difference between transmittancein the second non-display area NDA2 and transmittance in the displayarea DA may be reduced or minimized.

Meanwhile, in the transparent display panel 110 according to oneembodiment of the present disclosure, the pixel power line VDD, thecommon power line VSS and the reference line VREF may be provided inonly the first non-display area NDA1 and the second non-display areaNDA2 of the non-display area NDA. In the transparent display panel 110according to one embodiment of the present disclosure, each of the pixelpower line VDD, the common power line VSS and the reference line VREFmay be formed in a double layer structure, and each of the common powerline VSS and the reference line VREF provided in the first non-displayarea NDA1 may be connected with a plurality of connection electrodes.Therefore, even though the pixel power line VDD, the common power lineVSS and the reference line VREF are provided in only the firstnon-display area NDA1 and the second non-display area NDA2, thetransparent display panel 110 according to one embodiment of the presentdisclosure may make sure of a sufficient area of each of the pixel powerline VDD, the common power line VSS and the reference line VREF andreduce or minimize resistance.

In the transparent display panel 110 according to one embodiment of thepresent disclosure, as the pixel power line VDD, the common power lineVSS and the reference line VREF are not provided in the thirdnon-display area NDA3 and the fourth non-display area NDA4,transmittance in the third non-display area NDA3 and the fourthnon-display area NDA4 may be improved. That is, the transparent displaypanel 110 according to one embodiment of the present disclosure may havetransmittance even in the third non-display area NDA3 and the fourthnon-display area NDA4, which is similar to that of the display area DA.

It will be apparent to those skilled in the art that the presentdisclosure described above is not limited by the above-describedembodiments and the accompanying drawings and that varioussubstitutions, modifications, and variations can be made in the presentdisclosure without departing from the spirit or scope of thedisclosures. Consequently, the scope of the present disclosure isintended to cover all variations or modifications derived from themeaning, scope, and equivalent concept disclosed within the presentdisclosure.

The various embodiments described above can be combined to providefurther embodiments. All of the U.S. patents, U.S. patent applicationpublications, U.S. patent applications, foreign patents, foreign patentapplications and non-patent publications referred to in thisspecification and/or listed in the Application Data Sheet areincorporated herein by reference, in their entirety. Aspects of theembodiments can be modified, if necessary to employ concepts of thevarious patents, applications and publications to provide yet furtherembodiments.

These and other changes can be made to the embodiments in light of theabove-detailed description. In general, in the following claims, theterms used should not be construed to limit the claims to the specificembodiments disclosed in the specification and the claims, but should beconstrued to include all possible embodiments along with the full scopeof equivalents to which such claims are entitled. Accordingly, theclaims are not limited by the disclosure.

The invention claimed is:
 1. A transparent display device, comprising: asubstrate provided with a display area, in which a plurality ofsubpixels are disposed, and a non-display area adjacent to the displayarea; an anode electrode provided in each of the plurality of subpixelson the substrate; a light emitting layer provided on the anodeelectrode; a cathode electrode provided on the light emitting layer; adriving transistor including an active layer, a gate electrode, a sourceelectrode, and a drain electrode, wherein the driving transistor isprovided between the anode electrode and the substrate in the displayarea; a plurality of power lines provided in the non-display area on thesubstrate and extended in parallel in a first direction, wherein theplurality of power lines include a plurality of first common power linessupplying a first power source to the cathode electrode and including afirst metal layer and a second metal layer on the first metal layer; anda plurality of second common power lines extended from the display areain a second direction and connected with the plurality of first commonpower lines, respectively, wherein one of the first metal layer and thesecond metal layer of the first common power line is made of the samematerial as that of the source electrode and the drain electrode on thesame layer as the source electrode and the drain electrode, wherein thedisplay area includes first non-transmissive areas provided with theplurality of subpixels and a first transmissive area provided betweenthe first non-transmissive areas, and wherein the non-display areaincludes second non-transmissive areas provided with the plurality ofpower lines and a second transmissive area provided between the secondnon-transmissive areas.
 2. The transparent display device of claim 1,wherein the first transmissive area and the second transmissive areahave substantially the same width in the first direction.
 3. Thetransparent display device of claim 1, wherein the first transmissivearea provided in a unit area has substantially the same area as that ofthe second transmissive area provided in the unit area.
 4. Thetransparent display device of claim 1, wherein each of the plurality ofpower lines has a width substantially equal to or narrower than that ofthe second direction transverse to the first direction of the secondnon-transmissive area.
 5. The transparent display device of claim 4,wherein the second direction is perpendicular to the first direction. 6.The transparent display device of claim 1, further comprising a colorfilter on the plurality of power lines in the second non-transmissivearea.
 7. The transparent display device of claim 1, further comprising:a cathode contact portion electrically connecting the cathode electrodewith the first common power line, wherein the cathode contact portion isprovided in the second non-transmissive area.
 8. The transparent displaydevice of claim 1, wherein at least a part of the second metal layer isoverlapped with the first metal layer, and is connected to the firstmetal layer through a plurality of contact holes.
 9. The transparentdisplay device of claim 1, wherein the non-display area includes a firstnon-display area provided with a plurality of pads, and a secondnon-display area disposed in parallel with the first non-display area byinterposing the display area, and the second non-transmissive area andthe second transmissive area are disposed in the second non-displayarea.
 10. The transparent display device of claim 1, wherein the firsttransmissive area and the second transmissive area have the same orsubstantially the same shape.
 11. A transparent display device,comprising: a substrate provided with a display area, in which aplurality of subpixels are disposed, and a non-display area adjacent tothe display area; an anode electrode provided in each of the pluralityof subpixels on the substrate; a light emitting layer provided on theanode electrode; a cathode electrode provided on the light emittinglayer; a plurality of power lines provided in the non-display area onthe substrate and extended in parallel in a first direction, wherein theplurality of power lines include a plurality of first common power linessupplying a first power source to the cathode electrode; a plurality ofsecond common power lines extended from the display area in a seconddirection and connected with the plurality of first common power lines,respectively, a plurality of second pixel power lines extended from thedisplay area in the second direction and connected with the plurality offirst pixel power lines, respectively, wherein the display area includesfirst non-transmissive areas provided with the plurality of subpixelsand a first transmissive area provided between the firstnon-transmissive areas, and wherein the non-display area includes secondnon-transmissive areas provided with the plurality of power lines and asecond transmissive area provided between the second non-transmissiveareas, wherein the plurality of power lines further include a pluralityof first pixel power lines supplying a second power source to the anodeelectrode, and wherein the second pixel power lines and the secondcommon power lines are alternately disposed in the display area, and thefirst transmissive area is provided between the second pixel power lineand the second common power line.
 12. The transparent display device ofclaim 11, further comprising: a plurality of gate lines provided tooverlap the plurality of second common power lines and the plurality ofsecond pixel power lines in the display area, wherein the plurality ofsubpixels include a first subpixel provided to overlap a firstoverlapping area where the second common power line and the gate lineoverlap each other, a third subpixel provided to overlap a secondoverlapping area where the second pixel power line and the gate lineoverlap each other, and a second subpixel provided between the firstsubpixel and the third subpixel.
 13. A transparent display device,comprising: a substrate provided with a display area, in which aplurality of subpixels are disposed, a first non-display area on which apad is disposed, and a second non-display area disposed in parallel withthe first non-display area by interposing the display area; an anodeelectrode provided in each of the plurality of subpixels on thesubstrate; a light emitting layer on the anode electrode; a cathodeelectrode on the light emitting layer; a driving transistor including anactive layer, a gate electrode, a source electrode, and a drainelectrode, wherein the driving transistor is provided between the anodeelectrode and the substrate in the display area; a plurality of firstcommon power lines provided in the second non-display area on thesubstrate and electrically connected with the cathode electrode; and aplurality of second common power lines extended from the display area ina second direction and connected with the plurality of first commonpower lines, respectively, wherein the first common power line includesa first metal layer and a second metal layer on the first metal layer,wherein one of the first metal layer and the second metal layer of thefirst common power line is made of the same material as that of thesource electrode and the drain electrode on the same layer as the sourceelectrode and the drain electrode, and wherein the second non-displayarea includes a second non-transmissive area provided with the pluralityof first common power lines and a second transmissive area providedbetween the plurality of first common power lines.
 14. The transparentdisplay device of claim 13, wherein the first common power lines have awidth equal to or less than that of the second non-transmissive area.15. The transparent display device of claim 13, wherein the plurality offirst common power lines are respectively extended in parallel in thesecond non-transmissive area, and the display area includes firstnon-transmissive areas provided with the plurality of subpixels and afirst transmissive area, and the first transmissive area and the secondtransmissive area have the same or substantially the same width in afirst direction.
 16. The transparent display device of claim 15, whereinthe first transmissive area and the second transmissive area have thesame or substantially the same shape.
 17. The transparent display deviceof claim 13, further comprising: a third common power line provided inthe first non-display area on the substrate and electrically connectedwith the cathode electrode; a first common power connection electrodeelectrically connecting the second common power line with the pad; and asecond common power connection electrode disposed on a layer differentfrom the first common power connection electrode, electricallyconnecting the second common power line with the pad, wherein the firstcommon power connection electrode is provided between the third commonpower line and the substrate, and the second common power connectionelectrode is provided on the second common power line.
 18. Thetransparent display device of claim 17, wherein the second common powerconnection electrode is provided on the same layer as the anodeelectrode.